Yeast Balloon Experiment Worksheet

Science experiments lesson 16: Yeast balloon · Set 861 · 40 questions

What you do (Yeast is alive): 1. Pour warm (not hot) water into the bottle — an adult checks it. 2. Add the yeast and the sugar and swirl gently. 3. Stretch the balloon over the bottle’s mouth. 4. Wait 30 minutes, measure the balloon, then pour the mixture away and wash up.

1. 1.🧺 Do we need a paper clip for the yeast balloon? (a) needed (b) not needed
2. 2.🛟 The water for the yeast should be ___. (a) warm, not hot (b) ice cold (c) very salty (d) boiling hot
3. 3.True or false: a magnet is something yeast does not need. (a) False (b) True
4. 4.🧺 Do we need a mirror for the yeast balloon? (a) not needed (b) needed
5. 5.True or false: a battery cell is needed for the yeast balloon. (a) True (b) False
6. 6.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) a battery cell (c) dry yeast (d) a balloon
7. 7.🧺 Which of these is needed for the yeast balloon? (a) a battery cell (b) a comb (c) dry yeast (d) turmeric powder
8. 8.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is kept the same? (a) size of the balloon (b) the amount of water (c) the water temperature
9. 9.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is the one thing we change? (a) the amount of yeast (b) the amount of sugar (c) size of the balloon (d) the water temperature
10. 10.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the same bottles”? (a) we keep it the same (b) we change it (c) we measure it
11. 11.🧺 Do we need sugar for the yeast balloon? (a) not needed (b) needed
12. 12.🍞 Does yeast need sunlight to make gas? (a) yeast does not need it (b) yeast needs it
13. 13.🔍 Which is the odd one out? (a) salt (b) time (c) sugar (d) warm water
14. 14.🧺 Do we need warm water for the yeast balloon? (a) not needed (b) needed
15. 15.🛟 After the yeast experiment, what should you do with the mixture? (a) put it in your mouth (b) throw it at a wall (c) keep it for a month (d) pour it down the sink
16. 16.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) salt (d) warm water
17. 17.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of water”? (a) we change it (b) we measure it (c) we keep it the same
18. 18.🧺 Three of these are needed for the yeast balloon. Which one is NOT needed? (a) a small bottle (b) turmeric powder (c) warm water (d) sugar
19. 19.True or false: warm water is something yeast needs. (a) False (b) True
20. 20.🧺 Which of these is needed for the yeast balloon? (a) turmeric powder (b) a small bottle (c) a magnet (d) a battery cell
21. 21.True or false: sugar is something yeast does not need. (a) False (b) True
22. 22.True or false: a small bottle is needed for the yeast balloon. (a) False (b) True
23. 23.🔮 Predict (do not try it): yeast is put in boiling water. What happens? (a) it turns to sugar (b) it glows (c) it grows faster (d) the yeast is killed
24. 24.🍞 Why does yeast work slowly in cold water? (a) cold kills sugar (b) cold water is heavy (c) cold slows yeast down (d) cold makes it pink
25. 25.True or false: a comb is not needed for the yeast balloon. (a) True (b) False
26. 26.🍞 Does yeast need vinegar to make gas? (a) yeast does not need it (b) yeast needs it
27. 27.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? Which of these is what we measure? (a) size of the balloon (b) the water temperature (c) the amount of sugar (d) the amount of yeast
28. 28.🔮 Predict: you wait 2 hours instead of 10 minutes. What happens? (a) it turns to bread (b) it shrinks to nothing (c) the balloon is smaller (d) the balloon is bigger
29. 29.📘 What is yeast? (a) a kind of sugar (b) a tiny living fungus (c) a kind of stone (d) a kind of salt
30. 30.🎈 What blows up the balloon in the yeast experiment? (a) smoke (b) steam (c) carbon dioxide gas (d) air from outside
31. 31.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? What do we do with “the amount of yeast”? (a) we change it (b) we measure it (c) we keep it the same
32. 32.🍞 Does yeast need a magnet to make gas? (a) yeast does not need it (b) yeast needs it
33. 33.🔍 Which is the odd one out? (a) sunlight (b) vinegar (c) a magnet (d) sugar
34. 34.🧺 Do we need a comb for the yeast balloon? (a) not needed (b) needed
35. 35.🍞 Why do we add sugar to the yeast? (a) to make it heavy (b) to colour it (c) it is food for yeast (d) to make it sweet
36. 36.⚖️ Fair test — does yeast blow up the balloon more with warm water or cold water? True or false: the water temperature is what we measure. (a) False (b) True
37. 37.🧺 Which of these is needed for the yeast balloon? (a) a comb (b) a battery cell (c) a magnet (d) warm water
38. 38.True or false: sunlight is something yeast does not need. (a) True (b) False
39. 39.🍞 Does yeast need salt to make gas? (a) yeast needs it (b) yeast does not need it
40. 40.🍞 Does yeast need warm water to make gas? (a) yeast does not need it (b) yeast needs it

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